Question

Trace the various components of human evolution in the light of the following characteristic:

skeletal structure

Answer 1

1. Evolution from ape-like ancestors with knuckle-walking (Dryopithecus) to fully erect bipedalism in Australopithecus and Homo species.
2. The adoption of bipedalism involved a number of changes: a more vertical posture, four curves in the spine, a skull positioned apically with the foramen magnum underneath, changes in pelvis shape, longer lower limbs relative to arms, development of flat nails instead of claws, and a more mobile neck for head movement.
3. Facial structure evolved with reduced jaw and teeth size, loss of snout, development of a prominent chin, and higher braincase (vaulted cranium).
4. Posture became entirely upright, facilitating the use of hands for tool making and carrying.